Portable cooking stove



FIG. 1 is a top-plan view of a portable cooking stove showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a bottom-plan view thereof;

FIG. 4 is a top perspective view thereof; and

FIG. 5 is a bottom perspective view thereof. 

The ornamental design for a portable cooking stove, substantially as shown and described. 